MPC5643L datasheet(15/98 Pages) FREESCALE

15 / 98 page

Overview

MPC5643L Microcontroller Data Sheet, Rev. 3

Preliminary—Subject to Change Without Notice

Freescale Semiconductor

1.3.25

System Status and Configuration Module (SSCM)

The SSCM on this device features the following:

•

System configuration and status

•

Debug port status and debug port enable

•

Multiple boot code starting locations out of reset through implementation of search for valid Reset Configuration Half

Word

•

Sets up the MMU to allow user boot code to execute as either classic PowerPC Book E code (default) or as Freescale

VLE code out of flash memory

•

Triggering of device self-tests during reset phase of device boot

1.3.26

FlexCAN

The FlexCAN module is a communication controller implementing the CAN protocol according to Bosch Specification version

2.0B. The CAN protocol was designed to be used primarily as a vehicle serial data bus, meeting the specific requirements of

this field: real-time processing, reliable operation in the EMI environment of a vehicle, cost-effectiveness and required

bandwidth.

The FlexCAN module provides the following features:

•

Full implementation of the CAN protocol specification, version 2.0B

— Standard data and remote frames

— Extended data and remote frames

— 0 to 8 bytes data length

— Programmable bit rate as fast as 1Mbit/s

•

32 message buffers of 0 to 8 bytes data length

•

Each message buffer configurable as receive or transmit buffer, all supporting standard and extended messages

•

Programmable loop-back mode supporting self-test operation

•

Three programmable mask registers

•

Programmable transmit-first scheme: lowest ID or lowest buffer number

•

Time stamp based on 16-bit free-running timer

•

Global network time, synchronized by a specific message

•

Maskable interrupts

•

Independent of the transmission medium (an external transceiver is assumed)

•

High immunity to EMI

•

Short latency time due to an arbitration scheme for high-priority messages

•

Transmit features

— Supports configuration of multiple mailboxes to form message queues of scalable depth

— Arbitration scheme according to message ID or message buffer number

— Internal arbitration to guarantee no inner or outer priority inversion

— Transmit abort procedure and notification

•

Receive features

— Individual programmable filters for each mailbox

— Eight mailboxes configurable as a 6-entry receive FIFO

— Eight programmable acceptance filters for receive FIFO

•

Programmable clock source

— System clock

— Direct oscillator clock to avoid PLL jitter

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